Allow TypeBuilder::grow to take 0 as an argument (#4668)

There's no reason not to allow growing by zero slots, but previously doing so
would trigger an assertion. This caused a crash when roundtripping a trivial
module.

Fixes #4667.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/wasm/wasm-type.cpp b/src/wasm/wasm-type.cpp
index a9ce30e15..b3dd61a8e 100644
--- a/src/wasm/wasm-type.cpp
+++ b/src/wasm/wasm-type.cpp
@@ -2810,7 +2810,7 @@ TypeBuilder::TypeBuilder(TypeBuilder&& other) = default;
 TypeBuilder& TypeBuilder::operator=(TypeBuilder&& other) = default;
 
 void TypeBuilder::grow(size_t n) {
-  assert(size() + n > size());
+  assert(size() + n >= size());
   impl->entries.resize(size() + n);
 }